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s in (-oo:+oo)
s-(7.2/(-2.9)) = -5.2 // + 5.2
s-(7.2/(-2.9))+5.2 = 0
s+2.48275862+5.2 = 0
s+7.68275862 = 0 // - 7.68275862
s = -7.68275862
s = -7.68275862
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